Air wrench



R. H. MINER Oct. 13, 1931.

AIR WRENCH Filed May 29, 1930 Patented oct. 13, 1931 @ROY n. MINER, orLirivsruMICHIGANQASSIGNOR or ONE-HALF To ,DANIELLEVETT y SMITH; OF LANSING, MIICHIGAYN'I v l 'Ara WRENCH.

y pplicatlon, led'MraiyZS),y

The invention relates to air wrenches, and` has` for its principal object the provision oil improvementsin airv'wrenches by which the:

operation of air wrenches isV madesafe .iffor 5 the operator, and an air wrench may housed for 'turning on and off nutsv and cap screws byusing ,air motors of lower power thanhas heretofore been'used 'for the same size work,

mthus',reducingthe cost of the tool and the air` 10' pressure required for operation of the tool.

Inthe use .of air wrenches asat'present con- Heretfo're, it has been. the practice yin using air wrenchesto employ-a 'hand operated wrenchffor. inallysetting the nut or cap gm screw, and for loosening the nut or cap screw from a set position before applying the wrench, thus making two operations necessary, one the hand operation, and the other by means of the air tool. f This invention has for its object the provision of an attachment for air wrenches by which the same tool may be. used for operan tion by hand, and also by air so that the hand operation may immediately precede or follow *5l operation by the air motor without removal of the tool from position, thus saving time in operation of screwing and unscrewing nuts and cap screws.

i The invention Willwbe described in detail Q63 hereinafter and will be found illustrated in the accompanying drawings in which Figure 1 is a view in elevation of an air wrench with the improvementsl appliedI thereto,

Figure 2 is a longitudinal sectional view of the wrench attachment,

Figure 3 is a transverse sectional view on a plane indicated by the line 3-3 of Figure 1, Figure 4 is a similar view on a plane indio 'cated bythe line 4*-4 ofFigure 2, and

the tool is liable to getaway from the operaiY torV with more or less serious consequences.

` ing adapted to form the nozzle" for attach;

miao# se'ria'i No, 451153.

' Figure 'is a view similar'to Figure 4 shovv-` ing a slight modification of the'devic'e.y

In theV drawings similar reference characters are used to designate corresponding parts in all of the views.

of Grand Haven, Michigan,'but, except for mino11changes ,may be .applied to other types of air or pneumatic tools ofother manufacturers. i i provided with theusual handle`2`formanipu lating the tool, and :has a tubular :extension 3 through which the jInotorshaft A pro` trudes from the casing `1Lk The motor in the casingl is indicated at B.

The invention relates to that type oflpneul matic motor operatedwirenches having ral-1 dially extending arms 4 and 5, the arm 513e-v ment vof the air hose, said arms beingadapted to be utilized alsofor' manually turning they tool as will in'after; "z v Mounted onthe be more clearly brought out` here# lar member 3 as shown at a bolt 9 toclamp thehousing onlthe tubular member he tubular 'housing 6 -is also provided-with a` laterally extending ear-10'- ha'ving an opening ll'to receive a. threaded stud '12 on the casing 1i', and to be secured Ito;v thecasing by means 'of a nut on -said-stud* as shown .in Figurelfthis structure 'providing for Vva rigid connection between the housing ,6,

and the "motorcasing l; The-tubular housl-v ing 6 includesa sleeve 13' securedfthereto by set screws 14 orin any other suitable manner, and sleeve" 13 is provided with any annular in.-

terior shoulder 15.- fMounted in the tubular;

housing for rotatable movement is a-wrench member 16 including-a stem having a reduced' The motor casing, designated 1, is

In Figure 1 the improvements are'shown" applied to an air or pneumatic wrench ot' the Y type manufacturedby Wm. H. Keller Inc;`-

f i ,75' tubular` member 3 is atubui lar fhousingv 6, said housing beingsplitflon-v git-l'idinallyy from the end engaging the tubu' and-provided with laterallyextending flanges 8 to receivetoo Wrench member 16 also includes a ratchet member 19 that is secured to the stem of the member by means of a transverse pin 20 or by any other suitable means, 21 indicating a wrench bit secured to the end of the stem of the member by means of a set screw 22 or other suitable means. When the Wrench member 16 is in position in the tubular housing, the ratchet 19 limits the inward movement of the member by engaging the shoulder 15, and said ratchet member provides a bearing for the wrench member during operation, it being app arent that the wrench member may be readily removed. through the outer end of the tubular member 6 when desired in order to change the size ofthe wrench for the operation to be accomplished.

The sleeve 13 opposite the ratchet 19 is slotted as shown at E23 and provided with out- ',wardly extending ears 24rdeiining the side walls of said slotted opening 23, and 25 designates pawls pivoted on a pin 26 extended through said ears 2li and pawls and cooperating' with the ratchet 19. 27 indicates a Elea-f spring secured to the sleeve 13 by means of driven fastenings 28 and engaging` the pawls 25 to hold them in engagement with the ratchet 19. The sleevel is provided with threaded openings 29 at the opposite side thereof as shown in` Figure 4, so that the attachment may be utilized for turning up or unscrewing a nut or cap screw as may be de.- sired byremoving the screws 28 from one set of openings` removing the pin 26 and reversing the pawls and reversingthe position of the spring.

In Figure 5 is shown a slightly modified construction in which instead of having reversible pawl's 25 a double pawl or pawls 25a fis substituted, and the spring 27 extends around the sleeve 13 and has its two ends engaged with the opposite ends of the pawl,

this construction making it unnecessaryl to remove the pawls and spring and reverse their :positions as above described in connection the tool to be conveniently used for this pur' pose by turning it back and forth until the nut or cap screw is completely set. In un-l screwing a nut or cap screw it will be apparent that the operation will be reversed, as the nut or cap screw will first be unseated by hand, and the completion of the turning of the nut or cap screw will be accomplished quickly by means of the air motor.

What is claimed is 1.v In an air wrench including a motor and casing, the motor having a shaft,ra tubular member on said casing surrounding the shaft, a tubular housing adapted to be secured to said tubular member, a wrench member rotatable in said housing, said wrench member including a stem arranged axially of and adapted to engage said shaft, an annular ratchet secured to said Wrench member., and a pawl mounted on said housing and cooperating with said ratchet.

2. In an air wrench including a .motor and casing, the motor having a shaft, a tubular member 0n said casing and surrounding the shaft, radially extending arms secured to said casing, a tubular housing adapted to be secured to said tubular member, a wrench member rotatable in said housing and adapted to engage said shaft, an 4annular ratchet secured to said wrench member, and a pawl mounted on said housing and cooperating with said ratchet.

In an air wrench including a motor and casing, the motor having a shaft, a tubular member on said 'casing surrounding the shaft, radially extending arms secured to said casing, a tubular housing adapted to be secured to said tubular member, the housing being split longitudinally where engaging'said tubular member, and having a lateral ear on its engaging end, means to clamp said split portion on said tubular member, means on the motor casing engaging said ear to hold the housing from displacement on the member, a wrench member rotatable in said housing and adaptedto engage said shaft, 4an annular ratchet secured to said wrench member, and a pawl mounted onthe housing and cooperating with said ratchet.

In testimony whereof I aflix my signature.

y ROY H. MINER. 

